Invention Grant
US07848721B2 Antenna damping circuit and high frequency receiver employing same
有权
天线阻尼电路和采用高频接收机的高频接收机
- Patent Title: Antenna damping circuit and high frequency receiver employing same
- Patent Title (中): 天线阻尼电路和采用高频接收机的高频接收机
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Application No.: US11908739Application Date: 2005-11-07
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Publication No.: US07848721B2Publication Date: 2010-12-07
- Inventor: Kazuhisa Ishiguro
- Applicant: Kazuhisa Ishiguro
- Applicant Address: JP Tokyo
- Assignee: Ricoh Co., Ltd.
- Current Assignee: Ricoh Co., Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Connolly Bove Lodge & Hutz LLP
- Priority: JP2005-072002 20050314
- International Application: PCT/JP2005/020757 WO 20051107
- International Announcement: WO2006/098059 WO 20060921
- Main IPC: H04B1/18
- IPC: H04B1/18
Abstract:
An antenna damping circuit in which the frequency characteristics of damping amount can be made substantially flat by providing a resistor (Ra) between PIN diodes (D1, D2) having a resistance varying upon application of a control voltage (Vc) and a capacitive dummy antenna circuit (10), and setting its resistance high enough to neglect the capacity of the dummy antenna circuit (10) sufficiently when the dummy antenna circuit (10) is viewed from the side of the PIN diodes (D1, D2) thereby substantially eliminating the influence of capacity of the dummy antenna circuit (10).
Public/Granted literature
- US20090009266A1 Antenna Damping Circuit and High Frequency Receiver Employing Same Public/Granted day:2009-01-08
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